US5619008A - High density perforating system - Google Patents

High density perforating system Download PDF

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Publication number
US5619008A
US5619008A US08/613,065 US61306596A US5619008A US 5619008 A US5619008 A US 5619008A US 61306596 A US61306596 A US 61306596A US 5619008 A US5619008 A US 5619008A
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United States
Prior art keywords
liner
base
recited
perforating
well
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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US08/613,065
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English (en)
Inventor
Manmohan S. Chawla
James W. Reese
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Western Atlas International Inc
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Western Atlas International Inc
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Publication date
Application filed by Western Atlas International Inc filed Critical Western Atlas International Inc
Priority to US08/613,065 priority Critical patent/US5619008A/en
Assigned to WESTERN ATLAS INTERNATIONAL, INC. reassignment WESTERN ATLAS INTERNATIONAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAWLA, MANMOHAN S., REESE, JAMES W.
Priority to GB9704412A priority patent/GB2310918B/en
Priority to NO19970979A priority patent/NO311852B1/no
Priority to ARP970100884A priority patent/AR006115A1/es
Priority to IDP970721A priority patent/ID16146A/id
Application granted granted Critical
Publication of US5619008A publication Critical patent/US5619008A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/11—Perforators; Permeators
    • E21B43/116—Gun or shaped-charge perforators
    • E21B43/117—Shaped-charge perforators

Definitions

  • the present invention relates to the field of shaped charge firing guns for perforating casing and the borehole rock surface in hydrocarbon producing wells. More particularly, the present invention relates to a high density well perforating apparatus.
  • Well casing is typically installed in a borehole drilled into subsurface geologic formations.
  • the well casing prevents uncontrolled migration of subsurface fluids between different well zones, and provides a conduit for installing production tubing in the well.
  • the well casing also facilitates the running and installation of production tools in the well.
  • the well casing is perforated by high velocity jets from perforating gun shaped charges.
  • a firing head in the perforating gun is actuated to detonate a primary explosive and to ignite a booster charge connected to a primer or detonating cord.
  • the detonating cord transmits a detonation wave to each shaped charge.
  • Booster charges within each shaped charge activate explosive material to collapse a shaped charge liner into a shaped charge cavity.
  • the collapsing liner generates a high velocity jet for penetrating the well casing and the adjacent geologic formation.
  • jets perforate the well casing and establish a flow path for reservoir fluids from the subsurface geologic formations to a well casing interior.
  • packers isolate selected zones of the well casing, and production tubing transports the reservoir fluids from each zone to the well surface.
  • shaped charges are installed in the perimeter of a perforating gun housing.
  • the individual shaped charges are mechanically positioned in spirals and in other geometric orientations within the perforating gun. These shaped charge geometric orientations create "dead spaces" between adjacent shaped charges which limits the perforation density of the charges and reduces the perforating capability of the gun.
  • Perforating gun systems typically attach individual shaped charges to a charge carrier. This process requires significant labor and does not easily permit a high concentration of shaped charges in a perforating gun system.
  • carrier strips sometimes connect shaped charges in a perforating system. However, such charge carrier strips often fragment upon detonation and undesirably increase the debris within the wellbore.
  • the present invention provides an apparatus for generating a plurality of material perforating jets.
  • the apparatus comprises a liner having a plurality of indentations which each define a cavity open to a first surface and which define a protruding liner surface extending from an opposing second surface of said liner.
  • An explosive charge proximate to each protruding liner surface combines with the liner indentations to form shaped charges, and a detonator ignites the explosive charge to generate a plurality of material perforating jets.
  • a plurality of apertures are located in a base having an interior and an exterior surface.
  • the base can be substantially planar or can be formable into a geometric shape.
  • a liner proximate to the base exterior surface has an indentation extending into each aperture to define a cavity and to define a protruding liner surface extending from the base interior surface.
  • the base can be formed into a geometric shape insertable within a well, and the cavities can be oriented to control the shot pattern of material perforating jets generated by the explosive material and liner indentations.
  • FIG. 1 illustrates a crossectional view of one embodiment of the invention.
  • FIG. 2 illustrates a crossectional view of the invention after the detonator activates the explosive charges.
  • FIG. 3 illustrates an alternative embodiment of the invention.
  • FIG. 4 illustrates a planar base comprising a plurality of shaped charges.
  • FIG. 5 illustrates a planar base formed into a geometrical shape for insertion within a cylindrical housing.
  • FIG. 6 illustrates a liner having a different material for the shaped charge indentations.
  • the present invention provides a unique perforating system.
  • the invention is particularly useful in generating a high density shot pattern for perforating a well.
  • the invention is applicable to hydrocarbon producing wells and is equally useful in other applications requiring multiple shaped charges.
  • FIG. 1 illustrates a crossectional drawing of one embodiment of the invention.
  • Base 10 is illustrated as a substantially planar body having a plurality of apertures 12.
  • the term “plurality” is defined as three or more of the referenced element.
  • “Aperture” is defined as a hole or a recess in base 10.
  • base 10 has two parallel surfaces identified as interior surface 14 and exterior surface 16.
  • Base 10 can comprise any material such as a metal, ceramic, plastic, or other organic or inorganic material having the requisite physical properties. The selection of the material for base 10 will depend on the desired manufacturing procedures as described more thoroughly below.
  • Explosive charge 18 is positioned proximate to interior surface 14. Explosive charge 18 is formed with an RDX material or other high explosive material customarily used in the manufacture of shaped explosive charges. In one embodiment of the invention, holder 20 is positioned adjacent to interior surface 14 and retains explosive charge 18 in the desired position relative to interior surface 14. Holder 20 can comprise any material sufficient to retain explosive charge 18, and is preferably bonded to interior surface 14 with adhesives, solder, or other known processes. Although explosive charge 18 can be positioned proximate to interior surface 14, a plurality of explosive charges 18 can each be positioned proximate to corresponding apertures 12 in a preferred embodiment of the invention. For multiple explosive charges 18, a plurality of holders 20 can be positioned to retain each explosive charge 18.
  • Liner 22 which is metallic or nonmetallic, is proximate to exterior surface 16 and has liner indentations 24 defined as discrete planar segments of liner 22. As shown in FIG. 1, indentations 24 extend into apertures 12 and form cavities 26 and protruding liner surfaces 28. Each cavity 26 is open in a direction corresponding to exterior surface 16, and each protruding liner surface 28 extends from interior surface 14. In a preferred embodiment of the invention, cavity 26 is symmetrically shaped about an axis normal to exterior surface 16. Cavity 26 can be shaped as a cone, parabola, other other shape known in the art. Protruding liner surface 28 contacts explosive charge 18 and can have apex 30 or can be truncated.
  • Detonator 34 comprises a detonator cord or primer material which is placed proximate to explosive charge 18 for the purpose of activating explosive charge 18. Activation of detonator 34 initiates explosive charge 18 to generate a detonation wave for contacting apex 30 and for collapsing liner indentation 24 about cavity 26. As liner indentation 24 collapses, a high speed material perforating jet (not shown) is generated in a direction substantially parallel to the axis through cavity 26. The perforating jet perforates well casing or the geologic formation as shown in FIG. 2.
  • a single explosive charge 18 can initiate shock waves in multiple liner indentations 24, a preferred embodiment uses a separate explosive charge 18 proximate to each protruding liner surface 28 as shown in FIG. 3. This embodiment concentrates the power of explosive charge 18 in an efficient manner and reduces the fragmentation of base 10. Consequently, the amount of unconsolidated debris to be removed from the well after detonation is reduced. Foam 35 can be positioned between multiple explosive charges 18 to reduce charge interference.
  • FIG. 3 illustrates another embodiment of the invention wherein liner 36 includes liner indentations 38 having cavities 40 and protruding liner surfaces 42. Explosive charges 18 are positioned proximate to protruding liner surfaces 42, and detonator is engaged with explosive charges 18 as previously described.
  • liner 36 performs the combined function of base 10 and liner 22 described for the inventive embodiment illustrated in FIG. 1.
  • Liner indentations 38 which can be formed with a different material than the material for the non-indented portions of liner 36, cooperate with explosive charges 18 to form shaped charges 44.
  • the non-indented portion of liner 36 provides an integral base or housing for carrying shaped charges 44.
  • This embodiment of the invention facilitates manufacture because protruding liner surfaces 42 do not require alignment with apertures 12 in base 10 as shown in FIG. 1. In addition, such use of liner 36 eliminates alignment and adhesion procedures between base 10 and liner 22 in FIG. 1.
  • FIG. 4 illustrates a substantially flat liner material 36 having a plurality of liner indentations 38.
  • Liner material 36 can be stamped, rolled or otherwise formed to create indentations 38, and an explosive charge or charges 18 can be positioned adjacent protruding liner surfaces 42.
  • Manufacture of the assembly is simplified by initially combining liner 36 and explosive charges 18 in a planar form.
  • liner material 36 can be scored along marks 46 to form clean breaks in the surface of liner 36. Subsequently, liner 36 can be rolled, folded, fastened, or otherwise shaped to create a desired geometric exterior shape for insertion into a wellbore or other target environment.
  • the final geometric shape for shaped liner 36 can be planar, oval, spherical, hemispherical, cylindrical, or any other desired shape.
  • a single liner 36 can be formed into the desired geometric shape, or multiple liner sections can be connected to form the desired geometric shape.
  • FIG. 5 illustrates one geometric shape wherein liner 36 is formed in a substantially cylindrical shape suitable for insertion within a well.
  • detonator 34 can comprise a planar primasheet rolled into a cylinder for contacting explosive material 18.
  • the primasheet can be formed about core material 47 to provide rigidity to the primasheet.
  • Housing 48 can initially contain liner 36 to prevent fluid intrusion therein before shaped charges 44 are detonated. Additionally, housing 48 can be designed to contain debris generated during detonation of explosive charges 18 and can be manually withdrawn from the well with a wireline or other device.
  • the geometric shape of liner 36 determines the orientation of the perforating jets generated by shaped charges 44. If desired, such as in low side perforating operations, all of the shaped charges 44 can be oriented in a single direction. Alternatively, and to achieve maximum penetrating density from the perforating jets within a particular well zone, a plurality of shaped charges 44 are oriented in multiple directions.
  • FIG. 6 shows an alternative embodiment of the invention wherein liner surface 50 is attached to indentations 52 in contact with explosive charges 18.
  • Detonator 34 initiates explosive charges 18, and indentations 52 collapse about the respective cavities to form material penetrating jets.
  • liner surface 50 can be constructed to resist fragmentation, while indentations 52 can be formed with a material selected for a particular application.
  • Indentations 52 can be press fitted or otherwise adhered to liner surface 50 to form a combined apparatus, and the combination can be shaped into a desired geometrical shape as previously described.
  • the present invention provides a unique perforating apparatus which significantly reduces manufacturing costs.
  • the invention uniquely permits maximum shot density on the exterior surface area of a perforating gun, and is particularly suited for perforating wells such as hydrocarbon producing wells.
  • the invention provides flexibility in orienting the desired shot pattern and in creating maximum shot density in the desired direction.
  • the size and orientation of the shaped charges is easily formed by modifying the liner indentations and by modifying the size and shape of explosive charges 18.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US08/613,065 1996-03-08 1996-03-08 High density perforating system Expired - Fee Related US5619008A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US08/613,065 US5619008A (en) 1996-03-08 1996-03-08 High density perforating system
GB9704412A GB2310918B (en) 1996-03-08 1997-03-04 Shaped charge firing guns
NO19970979A NO311852B1 (no) 1996-03-08 1997-03-04 Perforeringsanordning
ARP970100884A AR006115A1 (es) 1996-03-08 1997-03-05 Disposicion perforadora de alta densidad
IDP970721A ID16146A (id) 1996-03-08 1997-03-07 Sistem pelubangan dengan kerapatan tinggi

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US08/613,065 US5619008A (en) 1996-03-08 1996-03-08 High density perforating system

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US5619008A true US5619008A (en) 1997-04-08

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US08/613,065 Expired - Fee Related US5619008A (en) 1996-03-08 1996-03-08 High density perforating system

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US (1) US5619008A (no)
AR (1) AR006115A1 (no)
GB (1) GB2310918B (no)
ID (1) ID16146A (no)
NO (1) NO311852B1 (no)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5785130A (en) * 1995-10-02 1998-07-28 Owen Oil Tools, Inc. High density perforating gun system
US5792977A (en) * 1997-06-13 1998-08-11 Western Atlas International, Inc. High performance composite shaped charge
US6014933A (en) * 1993-08-18 2000-01-18 Weatherford Us Holding, L.P. A Louisiana Limited Partnership Downhole charge carrier
US6021714A (en) * 1998-02-02 2000-02-08 Schlumberger Technology Corporation Shaped charges having reduced slug creation
DE19919041A1 (de) * 1999-04-27 2000-11-09 Daimler Chrysler Ag Sprengtechnisches Verfahren und Vorrichtung zum Eindringen in Bauwerke
US6202531B1 (en) * 1998-02-27 2001-03-20 The United States Of America As Represented By The Secretary Of The Army Land mine killer
US6209457B1 (en) * 1998-08-13 2001-04-03 Technology Commercialization Corp. Method and preformed composition for controlled localized heating of a base material using an exothermic reaction
US6298785B1 (en) * 1998-07-29 2001-10-09 Hitachi Zosen Corporation Blasting apparatus
US6349649B1 (en) 1998-09-14 2002-02-26 Schlumberger Technology Corp. Perforating devices for use in wells
US6460463B1 (en) 2000-02-03 2002-10-08 Schlumberger Technology Corporation Shaped recesses in explosive carrier housings that provide for improved explosive performance in a well
US20030116049A1 (en) * 2001-12-21 2003-06-26 Han Chenghua Oliver Pre-fragmented shaped charge
US6591911B1 (en) * 1999-07-22 2003-07-15 Schlumberger Technology Corporation Multi-directional gun carrier method and apparatus
US6662883B2 (en) 2001-09-07 2003-12-16 Lri Oil Tools Inc. Charge tube assembly for a perforating gun
US6772105B1 (en) * 1999-09-08 2004-08-03 Live Oak Ministries Blasting method
US20050045057A1 (en) * 2000-05-25 2005-03-03 Daniel Casenave Explosive round with controlled fragments
US20070095572A1 (en) * 2005-10-27 2007-05-03 Baker Hughes Incorporated Ballistic systems having an impedance barrier
US20070240599A1 (en) * 2006-04-17 2007-10-18 Owen Oil Tools Lp High density perforating gun system producing reduced debris
US20090078144A1 (en) * 2007-09-21 2009-03-26 Schlumberger Technology Corporation Liner for shaped charges
WO2006137949A3 (en) * 2005-02-17 2009-04-16 Raytheon Co Kinetic energy rod warhead with lower deployment angles
US7600476B1 (en) * 2006-03-24 2009-10-13 The United States Of America As Represented By The Secretary Of The Army Geometric/mechanical apparatus to improve well perforator performance
US20100000397A1 (en) * 2006-04-17 2010-01-07 Owen Oil Tools Lp High Density Perforating Gun System Producing Reduced Debris
US20110193199A1 (en) * 2010-02-09 2011-08-11 International Business Machines Corporation Electromigration immune through-substrate vias
CN103968719A (zh) * 2014-05-23 2014-08-06 中国科学技术大学 一体化分散式定向爆炸筒
CN103983153A (zh) * 2014-05-23 2014-08-13 中国科学技术大学 壳体环向非连续聚能射流致裂器
US20150268041A1 (en) * 2014-03-19 2015-09-24 The United States Of America As Represented By The Secretary Of The Navy Method for investigating early liner collapse in a shaped charge
US10000994B1 (en) * 2017-03-27 2018-06-19 IdeasCo LLC Multi-shot charge for perforating gun
US10443361B2 (en) 2017-03-27 2019-10-15 IdeasCo LLC Multi-shot charge for perforating gun
CN115143852A (zh) * 2022-08-08 2022-10-04 北京住总第一开发建设有限公司 一种城市隧道减震爆破结构及施工方法
US20230184066A1 (en) * 2021-12-15 2023-06-15 Halliburton Energy Services, Inc. Energy-Absorbing Impact Sleeve For Perforating Gun
RU222429U1 (ru) * 2023-08-29 2023-12-25 Хамит Гарипович Абдуллин Устройство для создания перфорационных каналов в скважине

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US2876843A (en) * 1954-08-23 1959-03-10 Jersey Prod Res Co Gun perforator
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US5542480A (en) * 1994-12-08 1996-08-06 Owen Oil Tools, Inc. Perforating gun with retrievable mounting strips

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US3934511A (en) * 1968-08-15 1976-01-27 The United States Of America As Represented By The Secretary Of The Navy Linear shaped charge warhead
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FR2514123B1 (fr) * 1981-10-01 1987-01-16 Serat Perfectionnements apportes aux charges militaires agissant contre des cibles en vol ou au sol
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Publication number Priority date Publication date Assignee Title
US2833213A (en) * 1951-04-13 1958-05-06 Borg Warner Well perforator
US2876843A (en) * 1954-08-23 1959-03-10 Jersey Prod Res Co Gun perforator
US3313234A (en) * 1966-03-28 1967-04-11 Petroleum Tool Res Inc Explosive well stimulation apparatus
US3739723A (en) * 1971-08-23 1973-06-19 Harrison Jet Guns Inc Perforating gun
US4253523A (en) * 1979-03-26 1981-03-03 Ibsen Barrie G Method and apparatus for well perforation and fracturing operations
US4850438A (en) * 1984-04-27 1989-07-25 Halliburton Company Modular perforating gun
US4773299A (en) * 1986-05-19 1988-09-27 Halliburton Company Well perforating apparatus and method
US4974515A (en) * 1988-07-14 1990-12-04 Diehl Gmbh & Co. Warhead
US5070786A (en) * 1990-09-26 1991-12-10 Honeywell Inc. Standoff sensor antennae for munitions having explosively formed penetrators
US5542480A (en) * 1994-12-08 1996-08-06 Owen Oil Tools, Inc. Perforating gun with retrievable mounting strips

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6014933A (en) * 1993-08-18 2000-01-18 Weatherford Us Holding, L.P. A Louisiana Limited Partnership Downhole charge carrier
US5785130A (en) * 1995-10-02 1998-07-28 Owen Oil Tools, Inc. High density perforating gun system
US5792977A (en) * 1997-06-13 1998-08-11 Western Atlas International, Inc. High performance composite shaped charge
US6021714A (en) * 1998-02-02 2000-02-08 Schlumberger Technology Corporation Shaped charges having reduced slug creation
US6202531B1 (en) * 1998-02-27 2001-03-20 The United States Of America As Represented By The Secretary Of The Army Land mine killer
US6298785B1 (en) * 1998-07-29 2001-10-09 Hitachi Zosen Corporation Blasting apparatus
US6209457B1 (en) * 1998-08-13 2001-04-03 Technology Commercialization Corp. Method and preformed composition for controlled localized heating of a base material using an exothermic reaction
US6349649B1 (en) 1998-09-14 2002-02-26 Schlumberger Technology Corp. Perforating devices for use in wells
DE19919041A1 (de) * 1999-04-27 2000-11-09 Daimler Chrysler Ag Sprengtechnisches Verfahren und Vorrichtung zum Eindringen in Bauwerke
US6591911B1 (en) * 1999-07-22 2003-07-15 Schlumberger Technology Corporation Multi-directional gun carrier method and apparatus
US20050010385A1 (en) * 1999-09-08 2005-01-13 Heck Jay Howard Blasting method
US6772105B1 (en) * 1999-09-08 2004-08-03 Live Oak Ministries Blasting method
US8538698B2 (en) 1999-09-08 2013-09-17 Live Oak Ministries Blasting method
US8380436B2 (en) 1999-09-08 2013-02-19 Live Oak Ministries Blasting method
US7418373B2 (en) 1999-09-08 2008-08-26 Live Oak Ministries Blasting method
US6523474B2 (en) 2000-02-03 2003-02-25 Schlumberger Technology Corporation Shaped recesses in explosive carrier housings that provide for improved explosive performance
US6460463B1 (en) 2000-02-03 2002-10-08 Schlumberger Technology Corporation Shaped recesses in explosive carrier housings that provide for improved explosive performance in a well
US20050045057A1 (en) * 2000-05-25 2005-03-03 Daniel Casenave Explosive round with controlled fragments
US7036432B2 (en) * 2000-05-25 2006-05-02 Etienne Lacroix Tous Artifices S.A. Explosive round with controlled explosive-formed fragments
US20090205529A1 (en) * 2001-08-23 2009-08-20 Lloyd Richard M Kinetic energy rod warhead with lower deployment angles
US7621222B2 (en) * 2001-08-23 2009-11-24 Raytheon Company Kinetic energy rod warhead with lower deployment angles
US6662883B2 (en) 2001-09-07 2003-12-16 Lri Oil Tools Inc. Charge tube assembly for a perforating gun
US20030116049A1 (en) * 2001-12-21 2003-06-26 Han Chenghua Oliver Pre-fragmented shaped charge
WO2006137949A3 (en) * 2005-02-17 2009-04-16 Raytheon Co Kinetic energy rod warhead with lower deployment angles
US7770662B2 (en) * 2005-10-27 2010-08-10 Baker Hughes Incorporated Ballistic systems having an impedance barrier
US20070095572A1 (en) * 2005-10-27 2007-05-03 Baker Hughes Incorporated Ballistic systems having an impedance barrier
US7600476B1 (en) * 2006-03-24 2009-10-13 The United States Of America As Represented By The Secretary Of The Army Geometric/mechanical apparatus to improve well perforator performance
CN101466994B (zh) * 2006-04-17 2013-09-18 欧文石油工具有限合伙公司 用于为地下地层射孔的设备及为地下地层射孔的方法
WO2008019173A3 (en) * 2006-04-17 2008-08-28 Owen Oil Tools Lp High density perforating gun system producing reduced debris
US20100000397A1 (en) * 2006-04-17 2010-01-07 Owen Oil Tools Lp High Density Perforating Gun System Producing Reduced Debris
US20140083283A1 (en) * 2006-04-17 2014-03-27 Owen Oil Tools Lp High Density Perforating Gun System Producing Reduced Debris
US20070240599A1 (en) * 2006-04-17 2007-10-18 Owen Oil Tools Lp High density perforating gun system producing reduced debris
US20090078144A1 (en) * 2007-09-21 2009-03-26 Schlumberger Technology Corporation Liner for shaped charges
US8156871B2 (en) * 2007-09-21 2012-04-17 Schlumberger Technology Corporation Liner for shaped charges
US20110193199A1 (en) * 2010-02-09 2011-08-11 International Business Machines Corporation Electromigration immune through-substrate vias
US8304863B2 (en) * 2010-02-09 2012-11-06 International Business Machines Corporation Electromigration immune through-substrate vias
US9153558B2 (en) 2010-02-09 2015-10-06 International Business Machines Corporation Electromigration immune through-substrate vias
US20150268041A1 (en) * 2014-03-19 2015-09-24 The United States Of America As Represented By The Secretary Of The Navy Method for investigating early liner collapse in a shaped charge
US9651509B2 (en) * 2014-03-19 2017-05-16 The United States Of America As Represented By The Secretary Of The Navy Method for investigating early liner collapse in a shaped charge
CN103968719A (zh) * 2014-05-23 2014-08-06 中国科学技术大学 一体化分散式定向爆炸筒
CN103983153A (zh) * 2014-05-23 2014-08-13 中国科学技术大学 壳体环向非连续聚能射流致裂器
US10000994B1 (en) * 2017-03-27 2018-06-19 IdeasCo LLC Multi-shot charge for perforating gun
US10443361B2 (en) 2017-03-27 2019-10-15 IdeasCo LLC Multi-shot charge for perforating gun
US20230184066A1 (en) * 2021-12-15 2023-06-15 Halliburton Energy Services, Inc. Energy-Absorbing Impact Sleeve For Perforating Gun
CN115143852A (zh) * 2022-08-08 2022-10-04 北京住总第一开发建设有限公司 一种城市隧道减震爆破结构及施工方法
CN115143852B (zh) * 2022-08-08 2023-10-20 北京住总第一开发建设有限公司 一种城市隧道减震爆破结构及施工方法
RU222429U1 (ru) * 2023-08-29 2023-12-25 Хамит Гарипович Абдуллин Устройство для создания перфорационных каналов в скважине

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Publication number Publication date
NO311852B1 (no) 2002-02-04
GB2310918A (en) 1997-09-10
NO970979L (no) 1997-09-09
GB9704412D0 (en) 1997-04-23
AR006115A1 (es) 1999-08-11
ID16146A (id) 1997-09-04
NO970979D0 (no) 1997-03-04
GB2310918B (en) 1999-12-08

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